My understanding is that there isn't yet a BMW version of the PSS, so I doubt that there will be any sort of special notation IF it was a PSS. I'm not saying that thsi applies to the previous poster, but some people don't know the different designations or the fact that even though the PSS is the successor to the PS2-and is even better performance, longer treadwear and lower cost-both tires are still being made and some manufactuerers still use the PS2 instead of the PSS.

I'd be interested to hear if BMW is actually supplying the new PSS...

My understanding is that the PS3 is the successor to the PS2. The PSS is a new category.